Structural Transition Produced by Electric Fields in Aqueous Sodium Deoxyribonucleate

摘要: It was found that the birefringence of aqueous solutions sodium DNA is anomalous when electric fields high intensity (≥104 v/cm) are applied. The magnitude first rose upon application orienting pulse, then fell as field sustained above a critical value. occurrence effect depended macromolecular and electrolyte concentrations. Upon removal field, rapidly restored it decayed with an increase reorientational relaxation times, relative to those observed below field. proposed may cause aggregation macromolecules produce structural transition concomitant orientation effect. This correspond “B” ⇌ “A” structures identified in x-ray studies, or “V” structure change, where postulated new helical form stabilized by cooperative interactions base dipoles Field induced transitions this type would be interest connection molecular mechanisms transport through membranes, nerve impulse transmission, information storage.